The sole focus of Stephen Ross and Jeff Ireland this offseason is to find the Dolphins a franchise quarterback. But they can’t help but feel a little nervous this morning.

Not only did the object of their affection, Peyton Manning, interview with the Broncos yesterday. He also stayed in Denver overnight, according to the Denver Post. And as Broncos beat writer Mike Klis pointed out, “Last time Broncos had their man stay overnight, John Fox was head coach by 11 the next morning.” Manning is supposed to meet with the Dolphins in the next few days, but that could change if he is wowed by Denver’s presentation.

As we wrote today, the Broncos’ support of Tim Tebow has always been tepid, at best. John Elway didn’t draft him, and he clearly wants a more traditional passer at quarterback. Denver fans went crazy for Tebow last year when he led the Broncos to the playoffs after taking over at 1-4, but if there’s one quarterback they want more than Tebow, it’s Manning.

Elsewhere, another potential franchise quarterback came off the market when the Redskins traded everything but the kitchen sink to St. Louis for the No. 2 draft pick and the right to pick Baylor QB Robert Griffin III.

The cost of the trade makes it quite clear why the Dolphins weren’t serious in pulling off the trade with St. Louis to get RG3, even though Ireland, a fellow Baylor alum, is a huge fan. In exchange for the No. 2 pick, the Redskins gave the Rams the No. 6 pick, this year’s second-rounder, and first-round picks in 2013 and 2014. For those keeping score at home, that’s three No. 1 picks and a No. 2.

Other blockbuster trades in NFL history:

* In 1999, the Saints traded their entire stock of draft picks, plus the next year’s No. 1 and 3, to move up four spots for Ricky Williams.

* In 2004, the Giants traded two No. 1s, a No. 3 and a No. 5 to San Diego for Eli Manning.

* In 2001, the Falcons traded a No. 1 and a No. 3 to move up four spots to take Michael Vick.

* Last year, Atlanta gave Cleveland two No. 1s, a No. 2 and two No. 4s to trade up and take receiver Julio Jones.

* In 1989, a total of 18 players and draft picks were involved in a trade between Dallas and Minnesota.the Cowboys acquired three No. 1s, three No. 2s, a No. 3, a No. 6 and five players for the rights to Herschel Walker and four mid-to-low round picks.

The Redskins’ trade yesterday is probably the second- or third-most expensive trade of all-time. The Walker trade remains the gold standard, leaving the RG3 and Ricky Williams trades to battle it out for second on the list.

With RG3 off the market, that potentially leaves Cleveland, Seattle and Miami (if it strikes out on Manning) to compete for the other top quarterbacks available — free agent Matt Flynn, and draft prospect Ryan Tannehill.

And in a last bit of quarterback news, the Jets gave Mark Sanchez a three-year contract extension yesterday after flirting with Manning. If that sounds familiar, it should — just last year, Tony Sparano received a three-year contract extension from the Dolphins after Ross flirted with Jim Harbaugh. Sparano, coincidentally, is now Sanchez’s offensive coordinator.

Like Sparano’s contract extension, Sanchez’s new deal puts more money in his pocket — Sanchez will reportedly receive over $20 million guaranteed in the next two years of the deal — but it still doesn’t solidify his place in the locker room. Some of Sanchez’s teammates felt he held the team back next year, and the Jets did flirt with the idea of replacing him with Manning this offseason.